Chair backrest



FIG. 1 is a perspective view of a chair backrest showing my new design,

FIG. 2 is a front view of the design;

FIG. 3 is a rear view of the design;

FIG. 4 is a left side view of the design;

FIG. 5 is a right side view of the design;

FIG. 6 is a top view of the design; and,

FIG. 7 is a bottom view of the design.

The ornamental design for a chair backrest, as shown and described.